<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>判断质数（高效版）</title>
</head>
<body>
    <script>
        function isPrime(mun) {
            // 取平方根
            let temp = parseInt(Math.sqrt(num))
            for (let i = 2; i <= temp; i++) {
                if (temp % i == 0) {
                    return false
                }
            }
            return true
        }
    </script>
</body>
</html>